Open command promt (in Windows Explorer hold the Shift key down and right-click on the folder where your PGNs are, then choose "Open command window here"). Then type the following:
copy /b *.pgn all.pgn
Is there a software to combine all my PGNs into one
Sort:
Is there a way I can combine all my PGNs into one? I have downloaded the PGNs of my games and they are somewhere near 150.. It will be very difficult to enter all the game in my database one by one so I am wondering if there is any software which can help me in that.